如何选择数据框中每组最旧的记录？使用python

import pandas as pd

data = {'Date': ['2022-01-01', '2022-01-02', '2022-01-03', '2022-01-01', '2022-01-02', '2022-01-03'],
        'Group': ['A', 'A', 'A', 'B', 'B', 'B']}
df = pd.DataFrame(data)

df['Date'] = pd.to_datetime(df['Date'])

oldest_records = df.groupby('Group').apply(lambda x: x.nsmallest(1, 'Date'))

print(oldest_records)

import pandas as pd

data = {'Date': ['2022-01-01', '2022-01-02', '2022-01-03', '2022-01-01', '2022-01-02', '2022-01-03'],
        'Group': ['A', 'A', 'A', 'B', 'B', 'B']}
df = pd.DataFrame(data)

df['Date'] = pd.to_datetime(df['Date'])

oldest_records = df.groupby('Group').apply(lambda x: x.nsmallest(1, 'Date'))

print(oldest_records)